Actuator swing forming layer without lap joint arc additive path planning method

Abstract

The application provides an electric arc additive path planning method for realizing non-overlapping swing forming in a layer, and the method is characterized in that: the swing filling path of a traditional magnesium alloy cold metal transition is segmented again, the path planning mode and swing parameters of an arc starting section and an arc extinguishing section are corrected, and a composite swing filling form is adopted to form, so that the forming defects caused by the large magnesium alloy spatter rate under the complex path caused by the swing path planning of the traditional cold metal transition and the shrinkage problem of the forming size of the arc starting section and the arc extinguishing section are solved, the adaptability of the swing forming path planning mode of the cold metal transition actuator in the magnesium alloy complex structure path planning is improved, and the forming quality and stability are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of additive manufacturing, in particular, to an electric arc additive path planning method for forming a non-overlapping layer in an actuator swing. BACKGROUND

[0002] Wire and Arc Additive Manufacture (WAAM) is a technique that uses an electric arc as a heat source to deposit metal layers on a substrate to build up a solid metal component.

[0003] There are two types of path planning methods for the electric arc additive manufacturing technique, one is a scanning filling-based path planning method, and the other is a contour filling-based path planning method. The former generally deposits a cross-sectional contour first, and then fills the contour with scanning. The latter generally fills each shape contour in a layer with different proportions of similar contours according to the single deposition width. When forming a large thick-walled structure, the above-mentioned path planning methods generally use multi-pass overlapping or actuator swing to fill the cross-sectional shape, and the swing filling method can greatly reduce the inter-pass overlap, the starting point and the ending point, and improve the internal quality of the formed part.

[0004] Patent application No. 201710250370.4 discloses a method for manufacturing a large thick-walled aluminum alloy structure by increasing the deposition forming width of a single pass through actuator swing. Under certain swing parameters, an electric arc additive of a 20mm thick aluminum alloy structure can be achieved. However, when the wall thickness is greater than 20mm, the method still needs to use overlapping tracks, which cannot avoid the problem of unstable forming quality when using multi-pass overlapping.

[0005] Patent application No. 202010208816.9 discloses a layer non-overlapping electric arc additive manufacturing path planning method. The method adds a processing allowance to the electric arc additive manufacturing structure to simplify the layered cross-sectional shape into a regular shape with an allowance. The method extracts the linear feature combination on the layered cross-sectional shape, further forms a linear path, and finally completes the additive path planning in the cross-section by swing filling. The method greatly reduces the number of electric arc additive manufacturing program statements and the number of starting and ending points, and eliminates the inter-pass overlap. However, the method does not solve the problems of forming collapse and size shrinkage in complex structure path planning.

[0006] Four common problems in arc additive manufacturing of cold metal transition forming of magnesium alloys are identified: ① A single oscillation cycle consists of one forward and one reverse oscillation, with identical parameters that cannot be independently adjusted. This results in poor adaptability to complex path planning and a tendency for forming collapse. ② Using the same oscillation parameters, amplitude convergence occurs near the arc initiation and extinguishing points. Under the influence of various factors such as molten pool fluidity and actuator acceleration, the forming dimensions of the arc initiation and extinguishing segments are much smaller than the preset dimensions. ③ The density of filling on the inner and outer sides of straight-to-arc, arc-to-straight, or broken-line paths varies, easily leading to filling defects. ④ Non-straight paths have overlapping areas with a large overlap rate, resulting in poor surface flatness and a large amount of spatter. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the purpose of this invention is to provide an arc additive manufacturing path planning method with no overlap within the swing forming layer of the actuator.

[0008] The method for arc additive manufacturing path planning without overlap within the oscillating forming layer of the actuator, provided by the present invention, includes:

[0009] Step 1: Optimization of the formed part model: Add machining allowance, hole filling and transition fillet to the magnesium alloy cold metal transition arc additive manufacturing formed part, so that the cross-sectional shape after layering and slicing is a more regular shape with allowance;

[0010] Step 2: Extract cross-sectional shape: Slice the arc additive manufacturing model into layers to obtain the cross-sectional shape data of each layer of the structural component;

[0011] Step 3: Extract the linear path: Extract the center line of the part with a center line in the direction of the linear path of any cross section, and extract the center line of the remaining part after filling, simplifying it into a single-channel swing filling forming linear path or a multi-segment linear path that meets the cross section shape.

[0012] Step 4: Segment the linear path again: Divide the above linear path into the starting arc segment Aa, the ending arc segment bB and the middle segment ab according to the starting arc point A and the ending arc point B. The starting arc segment Aa is divided into N linear path segments and the ending arc segment bB is divided into n linear path segments.

[0013] Step 5: Add composite oscillating fill: Select the oscillation mode for each path of the starting arc segment Aa, the middle segment ab, and the ending arc segment bB according to the cross-sectional characteristics, and set the corresponding oscillation parameters and path parameters.

[0014] Preferably, in step 4, the length of the arc segment Aa in the traditional swing path planning ranges from 3 to 25 mm, and the amplitude at point a is not 0. After the arc starts, the maximum amplitudes are ω1, ω2, and ω3 respectively, where ω1 is (0.4-0.6)ω, ω2 is (0.8-1.2)ω, and ω3 is (1-1.1)ω. The maximum amplitude of the remaining segments after the arc starts is ω. After further segmentation, it is divided into N linear paths, where N≥3. The length of the arc-extinguishing segment bB ranges from 3 to 20 mm, and the amplitude at point b is not 0. The maximum amplitudes before the arc extinguishing are ω4, ω5, and ω6 respectively, where ω4 is (0.8-1)ω, ω5 is (0.5-0.8)ω, and ω6 is (0.2-0.5)ω. The maximum amplitude of the remaining segments after the arc extinguishing is ω. After further segmentation, it is divided into n linear paths, where n≥2. The initial swing width is D, and the maximum amplitude in the stable state is ω=0.5D. The corrected amplitudes at points a and b are 0. The maximum amplitude ω1' of segment Aa1 is (0.7-1)ω, the maximum amplitude ω2' of segment a1a2 is (1.1-1.5)ω, the maximum amplitude ω3' of segment a2a3 is (1-1.2)ω, and the maximum amplitude range of the remaining segments after the arc is (1-1.1)ω, gradually converging until a N The maximum amplitude ω in segment A n '=ω,corrected bb n The maximum amplitude of segment b2b1 is ω4'=ω, the maximum amplitude of segment b2b1 is ω5' is (0.7-1)ω, the maximum amplitude of segment b1B is ω6' is (0.5-0.8)ω, and the maximum amplitude of the remaining segments after the arc is extinguished remains unchanged;

[0015] Preferably, in step 5, the composite oscillation filling refers to the positive and negative oscillation patterns, number of oscillations, and oscillation length L within a single oscillation cycle. 正 / L 反 Swing width D 正 / D 反 Edge stagnation time T 正 / T 反 and the center stagnation time T 中 It can be configured independently.

[0016] For arc additive manufacturing oscillating forming path planning with a line segment angle of θ, when 30°≤θ≤120°, the initial oscillation mode adopts Z-shaped or sinusoidal oscillation, the outer side of the corner adopts circular or sinusoidal oscillation, and the inner side adopts Z-shaped oscillation. By adjusting the outer side's dwell time, oscillation width, oscillation length, oscillation number, and the inner side's oscillation width and oscillation length, the maximum amplitude spacing of the two cycles on the inner side of the corner is made to be basically equal to the maximum amplitude spacing of the two cycles on the outer side, satisfying the consistency of the forming height of the inner and outer sides, and the corner has a smooth transition forming, and the forming size is ≥ the preset size; when 120°≤θ≤180°, the initial oscillation mode adopts Z-shaped or sinusoidal oscillation, and the oscillation mode of the outer and inner sides of the corner is not changed. By adjusting the outer side's dwell time, oscillation width, oscillation length, and the inner side's oscillation width and oscillation length, the maximum amplitude spacing of the two cycles on the inner side of the corner is made to be basically equal to the maximum amplitude spacing of the two cycles on the outer side, satisfying the consistency of the forming height of the inner and outer sides, and the corner has a smooth transition forming, and the forming size is ≥ the preset size;

[0017] For the planning of an arc-shaped oscillation forming path from a straight line to a circular arc with radius R, or from a circular arc to a straight line, when R≤5mm, it is equivalent to a broken line segment path with an included angle θ=90°; when R≥5mm, the initial oscillation mode adopts a Z-shaped or sinusoidal oscillation, the outer side of the arc corner adopts a circular or sinusoidal oscillation, and the inner side adopts a Z-shaped or sinusoidal oscillation. By adjusting the outer side's dwell time, oscillation width, oscillation length, oscillation number, and the inner side's oscillation width and oscillation length, the maximum amplitude spacing of the two cycles on the inner side of the arc and the maximum amplitude spacing of the two cycles on the outer side are basically equal, satisfying the consistency of the forming height of the inner and outer sides, and the corner is smoothly transitioned, and the forming size is ≥ the preset size.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) The cold metal transition oscillation forming path of magnesium alloy was divided into two segments: the arc starting segment, the middle segment and the arc ending segment. Without changing the initial setting of the swing width, the path process parameters and oscillation parameters of the arc starting segment and the arc ending segment were modified respectively, which can improve the size shrinkage problem of the arc starting segment and the arc ending segment.

[0020] (2) The composite swing filling method replaces the traditional swing filling method of cold metal transition. The path of broken line segment, straight line to arc or arc to straight line is optimized, which effectively reduces the splashing rate, improves the adaptability of the swing forming path planning method of cold metal transition actuator in complex magnesium alloy structure, and improves the forming quality and stability. Attached Figure Description

[0021] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0022] Figure 1 This is a schematic diagram of the oscillating forming straight segment path of a typical magnesium alloy cold metal transition actuator;

[0023] Figure 2 A schematic diagram of the path for the oscillating formation of the actuator in the revised arc initiation segment Aa and arc extinguishing segment bB;

[0024] Figure 3 A schematic diagram of the oscillating forming broken line path of a typical magnesium alloy cold metal transition actuator;

[0025] Figure 4 A revised schematic diagram of the typical actuator's oscillating forming broken line segment path;

[0026] Figure 5 This is a schematic diagram of the path of a typical magnesium alloy cold metal transition actuator for oscillating forming a straight line to an arc segment.

[0027] Figure 6 A revised schematic diagram of the path of a typical actuator swinging to form a straight line to an arc segment. Detailed Implementation

[0028] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0029] This invention primarily addresses the forming defects caused by the high spatter rate of magnesium alloy under complex paths due to traditional cold metal transition oscillation path planning, as well as the dimensional shrinkage problems of the starting and ending arc segments by further segmenting the magnesium alloy cold metal transition oscillation filling path and correcting the path planning and oscillation parameters of the arc initiation and arc extinguishing segments, and adopting a composite oscillation filling method for forming. The specific implementation steps are as follows:

[0030] Step 1: Optimization of the formed part model: Add machining allowance, hole filling and transition fillet to the magnesium alloy cold metal transition arc additive manufacturing formed part, so that the cross-sectional shape after layering and slicing is a more regular shape with allowance;

[0031] Step 2: Extract cross-sectional shape: Slice the arc additive manufacturing model into layers to obtain the cross-sectional shape data of each layer of the structural component;

[0032] Step 3: Extract the linear path: Extract the center line of the part with a center line in the direction of the linear path of any cross section, and extract the center line of the remaining part after filling, simplifying it into a single-channel swing filling forming linear path or a multi-segment linear path that meets the cross section shape.

[0033] Step 4: Segment the linear path again: Divide the above linear path into the starting arc segment Aa, the ending arc segment bB and the middle segment ab according to the starting arc point A and the ending arc point B. The starting arc segment Aa is divided into N linear path segments and the ending arc segment bB is divided into n linear path segments.

[0034] Step 5: Add composite oscillating fill: Select the oscillation mode for each path of the starting arc segment Aa, the middle segment ab, and the ending arc segment bB according to the cross-sectional characteristics, and set the corresponding oscillation parameters and path parameters.

[0035] In step 1, the transition fillet radius of the magnesium alloy model is optimized to be within the range of 0.5-5mm. The transition fillet radius is kept as small as possible without affecting the forming stability, thereby reducing the machining allowance.

[0036] In step 4, the length of the arc segment Aa in the traditional swing path planning ranges from 3 to 25 mm, and the amplitude at point a is not 0. After the arc starts, the maximum amplitudes are ω1, ω2, and ω3, respectively. ω1 is (0.4-0.6)ω, ω2 is (0.8-1.2)ω, and ω3 is (1-1.1)ω. The maximum amplitude of the remaining segments after the arc starts is ω. After further segmentation, it is divided into N linear paths, where N≥3. The length of the arc-extinguishing segment bB ranges from 3 to 20 mm, and the amplitude at point b is not 0. The maximum amplitudes before the arc extinguishing are ω4, ω5, and ω6, respectively. ω4 is (0.8-1)ω, ω5 is (0.5-0.8)ω, and ω6 is (0.2-0.5)ω. The maximum amplitude of the remaining segments after the arc extinguishing is ω. After further segmentation, it is divided into n linear paths, where n≥2. The initial swing width is D, and the maximum amplitude in the stable state is ω=0.5D. The corrected amplitudes at points a and b are 0. The maximum amplitude ω1' of segment Aa1 is (0.7-1)ω, the maximum amplitude ω2' of segment a1a2 is (1.1-1.5)ω, the maximum amplitude ω3' of segment a2a3 is (1-1.2)ω, and the maximum amplitude range of the remaining segments after the arc is (1-1.1)ω, gradually converging until a N The maximum amplitude ω in segment A n '=ω,corrected bb n The maximum amplitude of segment b2b1 is ω4'=ω, the maximum amplitude of segment b2b1 is ω5' is (0.7-1)ω, the maximum amplitude of segment b1B is ω6' is (0.5-0.8)ω, and the maximum amplitude of the remaining segments after the arc is extinguished remains unchanged;

[0037] In step 5, the composite oscillation filling refers to the positive and negative oscillation patterns, number of oscillations, and oscillation length L within a single oscillation cycle. 正 / L 反Swing width D 正 / D 反 Edge stagnation time T 正 / T 反 and the center stagnation time T 中 It can be configured independently.

[0038] For arc additive manufacturing oscillating forming path planning with a line segment angle of θ, when 30°≤θ≤120°, the initial oscillation mode adopts Z-shaped or sinusoidal oscillation, the outer side of the corner adopts circular or sinusoidal oscillation, and the inner side adopts Z-shaped oscillation. By adjusting the outer side's dwell time, oscillation width, oscillation length, oscillation number, and the inner side's oscillation width and oscillation length, the maximum amplitude spacing of the two cycles on the inner side of the corner is made to be basically equal to the maximum amplitude spacing of the two cycles on the outer side, satisfying the consistency of the forming height of the inner and outer sides, and the corner has a smooth transition forming, and the forming size is ≥ the preset size; when 120°≤θ≤180°, the initial oscillation mode adopts Z-shaped or sinusoidal oscillation, and the oscillation mode of the outer and inner sides of the corner is not changed. By adjusting the outer side's dwell time, oscillation width, oscillation length, and the inner side's oscillation width and oscillation length, the maximum amplitude spacing of the two cycles on the inner side of the corner is made to be basically equal to the maximum amplitude spacing of the two cycles on the outer side, satisfying the consistency of the forming height of the inner and outer sides, and the corner has a smooth transition forming, and the forming size is ≥ the preset size;

[0039] For the planning of an arc-shaped oscillation forming path from a straight line to a circular arc with radius R, or from a circular arc to a straight line, when R≤5mm, it is equivalent to a broken line segment path with an included angle θ=90°; when R≥5mm, the initial oscillation mode adopts a Z-shaped or sinusoidal oscillation, the outer side of the arc corner adopts a circular or sinusoidal oscillation, and the inner side adopts a Z-shaped or sinusoidal oscillation. By adjusting the outer side's dwell time, oscillation width, oscillation length, oscillation number, and the inner side's oscillation width and oscillation length, the maximum amplitude spacing of the two cycles on the inner side of the arc and the maximum amplitude spacing of the two cycles on the outer side are basically equal, satisfying the consistency of the forming height of the inner and outer sides, and the corner is smoothly transitioned, and the forming size is ≥ the preset size.

[0040] Example 1: Path planning for cold metal transition arc additive oscillating forming of a 100mm long magnesium alloy thick straight-walled structure

[0041] like Figure 1 As shown, the initial oscillation mode is set as a "Z" shaped oscillation with an oscillation width of 20mm, i.e., the maximum amplitude ω = 10mm in the stable state. The pendulum length is 5mm, the length of the initial arc segment Aa is 11mm, consisting of 4 linear paths, with the amplitude at point a being 0. The length of the final arc segment bB is 9mm, consisting of 3 linear paths, with the amplitude at point b being 0. ω1 to ω6 represent the amplitudes of each segment before correction. Figure 2As shown, the corrected Aa1 segment has a length of 2.5mm and a maximum amplitude of 8mm; the a1a2 segment has a length of 2.5mm and a maximum amplitude of 14mm; the a2a3 segment has a length of 3mm and a maximum amplitude of 12mm; the a2a3 segment has a length of 3mm and a maximum amplitude ω3' = 10mm; the corrected bb3 segment has a length of 2.5mm and a maximum amplitude of 10mm; the b3b2 segment has a length of 2.5mm and a maximum amplitude of 10mm; the b2b1 segment has a length of 2mm and a maximum amplitude of 9mm; and the b1B segment has a length of 2mm and a maximum amplitude of 6mm. The middle segment ab has a length of 80mm and does not require adjustment of the initial oscillation parameters.

[0042] Example 2: Path planning for cold metal transition arc additive oscillating forming of magnesium alloy with a broken line segment angle of θ

[0043] like Figure 3 The diagram shows a typical oscillating forming path of a broken line segment in an actuator. When 30°≤θ≤120°, by adjusting the preset swing length and frequency, to ensure flawless forming at the corner points, the path overlap rate at this point is typically ≥25%, resulting in a larger splash rate, uneven forming surface, and forming size ≤ preset size. The initial oscillation method is set to a "Z" shaped oscillation with a oscillation width of 15mm. The outer corner is changed to an arc-shaped oscillation with an increased oscillation width of 20mm and the number of oscillations on the outer side increased to 2, with an added 0.1s pause time on the outer side. The inner side still uses a "Z" shaped oscillation with a reduced oscillation width of 10mm. The path diagram is shown below. Figure 4 As shown, the overlap rate of the inflection point can be effectively reduced, while the forming height of the inner and outer sides is well consistent, the forming surface is relatively flat, the forming height of the inner and outer sides is consistent, the corners are smoothly formed, and the forming size is greater than or equal to the preset size.

[0044] When 180°≥θ≥120°, the initial swing mode is set to "Z" shaped swing with a swing width of 15mm. The outer corner uses sinusoidal swing with a swing width increased to 19mm, and an outer pause time of 0.2s is added. The inner side uses "Z" shaped swing with a swing width reduced to 11mm to ensure consistent forming height between the inner and outer sides, smooth transition forming at the corner, and forming size ≥ preset size.

[0045] Example 3: Path planning for straight-line to circular arc path of radius R in magnesium alloy cold metal transition arc additive oscillation forming

[0046] When R ≤ 5mm, the path from a straight line to an arc with radius R can be referenced to a broken line segment with an included angle of 90°. When R ≥ 5mm, by adjusting the preset pendulum length and frequency, the traditional actuator swing path planning generally presents as follows: Figure 5As shown, this is a typical linear-to-circular arc path for arc additive manufacturing with a radius of R. The infill density differs between the inner and outer sides, with the inner side being significantly higher than the outer side. When the height difference is ≥2mm, the inner side is prone to significant spattering, potentially causing wire blockage and void defects, while the outer side is prone to infill collapse. The initial oscillation method is set as a "Z" shaped oscillation with a width of 15mm. At the corners, a circular arc oscillation is used on the outer side, increasing the oscillation width to 20mm and increasing the number of oscillations to 2, with an additional 0.1s pause time added. The inner side uses a "Z" shaped oscillation with a reduced oscillation width of 10mm. The path diagram is shown below. Figure 6 As shown, the maximum amplitude spacing between the two cycles on the inner side of the arc and the maximum amplitude spacing between the two cycles on the outer side are basically equal, satisfying the consistency of the forming height between the inner and outer sides, and the corners are smoothly formed, and the forming size is greater than or equal to the preset size.

[0047] Compared to the traditional path planning method for oscillating filling of magnesium alloy cold metal transition actuators, the path planning method of the oscillating filling path in this invention is further segmented and the path planning methods and oscillation parameters of the arc initiation and arc extinguishing segments are modified. The composite oscillating filling method is then used for forming, which solves the forming defects caused by the large spatter rate of magnesium alloy under complex paths caused by the traditional cold metal transition oscillating path planning, as well as the size shrinkage problem of the arc initiation and arc extinguishing segments. This improves the adaptability of the oscillating forming path planning method of cold metal transition actuators to complex magnesium alloy structures and enhances the forming quality and stability.

[0048] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A method for arc additive manufacturing path planning without overlap within the oscillating forming layer of an actuator, characterized in that, include: Step 1: Optimization of the formed part model: Add machining allowance, hole filling and transition fillet to the cold metal transition arc additive manufacturing magnesium alloy formed part, so that the cross-sectional shape after layering and slicing is a more regular shape with allowance; Step 2: Extract cross-sectional shape: Slice the arc additive manufacturing model into layers to obtain the cross-sectional shape data of each layer of the structural component; Step 3: Extract the linear path: Extract the center line of the part with a center line in the direction of the linear path of any cross section, and extract the center line of the remaining part after filling, simplifying it into a single-channel swing filling forming linear path or a multi-segment linear path that meets the cross section shape. Step 4: Segment the linear path again: Divide the above linear path into the starting arc segment Aa, the ending arc segment bB and the middle segment ab according to the starting arc point A and the ending arc point B. The starting arc segment Aa is divided into N linear path segments and the ending arc segment bB is divided into n linear path segments. Step 5: Add composite oscillating fill: Select the oscillation mode for each path of the starting arc segment Aa, the middle segment ab, and the ending arc segment bB according to the cross-sectional characteristics, and set the corresponding oscillation parameters and path parameters; In step 1, the transition fillet radius of the magnesium alloy model is optimized to be within the range of 0.5-5mm. The transition fillet radius is kept as small as possible without affecting the forming stability, thereby reducing the machining allowance. In step 4, the length of the arc segment Aa in the traditional swing path planning ranges from 3 to 25 mm, and the amplitude at point a is not 0. After the arc starts, the maximum amplitudes are ω1, ω2, and ω3 respectively, where ω1 is (0.4-0.6)ω, ω2 is (0.8-1.2)ω, and ω3 is (1-1.1)ω. The maximum amplitude of the remaining segments after the arc starts is ω. After further segmentation, it is divided into N linear paths, where N≥3. The length of the arc-extinguishing segment bB ranges from 3 to 20 mm, and the amplitude at point b is not 0. The maximum amplitudes before the arc extinguishing are ω4, ω5, and ω6 respectively, where ω4 is (0.8-1)ω, ω5 is (0.5-0.8)ω, and ω6 is (0.2-0.5)ω. The maximum amplitude of the remaining segments after the arc extinguishing is ω. After further segmentation, it is divided into n linear paths, where n≥2. The initial swing width is D, and the maximum amplitude in the stable state is ω=0.5D. The corrected amplitudes at points a and b are 0. The maximum amplitude ω1' of segment Aa1 is (0.7-1)ω, the maximum amplitude ω2' of segment a1a2 is (1.1-1.5)ω, the maximum amplitude ω3' of segment a2a3 is (1-1.2)ω, and the maximum amplitude range of the remaining segments after the arc is (1-1.1)ω, gradually converging until a N The maximum amplitude ω in segment A n '=ω,corrected bb n The maximum amplitude of segment b2b1 is ω4'=ω, the maximum amplitude of segment b2b1 is ω5' is (0.7-1)ω, the maximum amplitude of segment b1B is ω6' is (0.5-0.8)ω, and the maximum amplitude of the remaining segments after the arc is extinguished remains unchanged; In step 5, the composite oscillation filling refers to the positive and negative oscillation patterns, number of oscillations, and oscillation length L within a single oscillation cycle. 正 / L 反 Swing width D 正 / D 反 Edge stagnation time T 正 / T 反 and the center stagnation time T 中 It can be set independently, and they don't have to be exactly the same; For arc additive manufacturing oscillating forming path planning with a line segment angle of θ, when 30°≤θ≤120°, the initial oscillation mode adopts Z-shaped or sinusoidal oscillation, the outer side of the corner adopts circular or sinusoidal oscillation, and the inner side adopts Z-shaped oscillation. By adjusting the outer side's dwell time, oscillation width, oscillation length, oscillation number, and the inner side's oscillation width and oscillation length, the maximum amplitude spacing between the two cycles on the inner side of the corner and the maximum amplitude spacing between the two cycles on the outer side are equal, satisfying the consistency of the forming height between the inner and outer sides, and the corner has a smooth transition forming, and the forming size is ≥ the preset size; when 120°≤θ≤180°, the initial oscillation mode adopts Z-shaped or sinusoidal oscillation, and the oscillation mode on the outer and inner sides of the corner is not changed. By adjusting the outer side's dwell time, oscillation width, oscillation length, and the inner side's oscillation width and oscillation length, the maximum amplitude spacing between the two cycles on the inner side of the corner and the maximum amplitude spacing between the two cycles on the outer side are equal, satisfying the consistency of the forming height between the inner and outer sides, and the corner has a smooth transition forming, and the forming size is ≥ the preset size; For the planning of an arc-shaped oscillation forming path from a straight line to a circular arc with radius R, or from a circular arc to a straight line, when R≤5mm, it is equivalent to a broken line segment path with an included angle θ=90°; when R≥5mm, the initial oscillation mode adopts a Z-shaped or sinusoidal oscillation, the outer side of the circular arc corner adopts a circular or sinusoidal oscillation, and the inner side adopts a Z-shaped or sinusoidal oscillation. By adjusting the outer side's dwell time, oscillation width, oscillation length, oscillation number, and the inner side's oscillation width and oscillation length, the maximum amplitude spacing of the two cycles on the inner side of the circular arc and the maximum amplitude spacing of the two cycles on the outer side are equal, satisfying the consistency of the forming height of the inner and outer sides, and the corner is smoothly transitioned, and the forming size is ≥ the preset size.

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